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I still preferred it over IE6 (which was just a bit too dodgy for my liking, and hadn't been updated in years, but when IE 7 came out... I switched!
Then I heard (late) of the Firefox 3 beta. I downloaded a copy of Beta 1, installed it and... it was great! It was Firefox, but fast, until you opened up a few tabs. The Beta 2 came out and it is fast, and nowhere near a memory junkie.
That's my first impression - speed. It is faster than IE 7 - it even uses less memory than IE 7, which is cool. Now, even though it's just a beta, I've switched back to Firefox.